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Dear Sirs:I created a CCX program by WinAC ODK V4.2. The environment is VC++ 6.0. I just use a windows dll . Not RTDLL.My purpose is to read a csv file and find a value . Then I write the index of this value to S7 memory.(MW500) But the read csv function doesn't work and the write value to S7 memory works in the DLL. I also identify my source code of read csv function. I create a Win32 console application (*.exe) and put the same code of read csv function. The application can work. So, I don't know why the DLL can't work but the application can work.

ps:(a).My test platform: WinAC RTX v4.4.1 in a Panel PC 677.

(b).The attached files: One is the CCX program created by ODK4.2.

The other is my identified Win32 application of read csv function. C1.csv is the test file.